// target-select.cc -- select a target for an object file
-// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+// Copyright (C) 2006-2020 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include "gold.h"
+#include <cstdio>
#include <cstring>
#include "elfcpp.h"
+#include "options.h"
+#include "parameters.h"
#include "target-select.h"
namespace
namespace gold
{
+// Class Set_target_once.
+
+void
+Set_target_once::do_run_once(void*)
+{
+ this->target_selector_->set_target();
+}
+
// Construct a Target_selector, which means adding it to the linked
// list. This runs at global constructor time, so we want it to be
// fast.
-Target_selector::Target_selector(int amachine, int size, bool is_big_end,
- const char* bfdname)
- : machine_(amachine), size_(size), is_big_endian_(is_big_end),
- bfd_name_(bfdname), instantiated_target_(NULL), lock_(NULL),
- initialize_lock_(&this->lock_)
-
+Target_selector::Target_selector(int machine, int size, bool is_big_endian,
+ const char* bfd_name, const char* emulation)
+ : machine_(machine), size_(size), is_big_endian_(is_big_endian),
+ bfd_name_(bfd_name), emulation_(emulation), instantiated_target_(NULL),
+ set_target_once_(this)
{
this->next_ = target_selectors;
target_selectors = this;
}
-// Instantiate the target and return it. Use a lock to avoid
-// instantiating two instances of the same target.
+// Instantiate the target and return it. Use SET_TARGET_ONCE_ to
+// avoid instantiating two instances of the same target.
Target*
Target_selector::instantiate_target()
{
- // We assume that the pointer will either be written entirely or not
- // at all.
- if (this->instantiated_target_ == NULL)
- {
- this->initialize_lock_.initialize();
- Hold_optional_lock hl(this->lock_);
- if (this->instantiated_target_ == NULL)
- this->instantiated_target_ = this->do_instantiate_target();
- }
+ this->set_target_once_.run_once(NULL);
return this->instantiated_target_;
}
+// Instantiate the target. This is called at most once.
+
+void
+Target_selector::set_target()
+{
+ gold_assert(this->instantiated_target_ == NULL);
+ this->instantiated_target_ = this->do_instantiate_target();
+}
+
+// If we instantiated TARGET, return the corresponding BFD name.
+
+const char*
+Target_selector::do_target_bfd_name(const Target* target)
+{
+ if (!this->is_our_target(target))
+ return NULL;
+ const char* my_bfd_name = this->bfd_name();
+ gold_assert(my_bfd_name != NULL);
+ return my_bfd_name;
+}
+
// Find the target for an ELF file.
Target*
-select_target(int machine, int size, bool is_big_endian, int osabi,
- int abiversion)
+select_target(Input_file* input_file, off_t offset,
+ int machine, int size, bool is_big_endian,
+ int osabi, int abiversion)
{
for (Target_selector* p = target_selectors; p != NULL; p = p->next())
{
&& p->get_size() == size
&& (p->is_big_endian() ? is_big_endian : !is_big_endian))
{
- Target* ret = p->recognize(machine, osabi, abiversion);
+ Target* ret = p->recognize(input_file, offset,
+ machine, osabi, abiversion);
if (ret != NULL)
return ret;
}
// --oformat option.
Target*
-select_target_by_name(const char* name)
+select_target_by_bfd_name(const char* name)
{
for (Target_selector* p = target_selectors; p != NULL; p = p->next())
{
const char* pname = p->bfd_name();
if (pname == NULL || strcmp(pname, name) == 0)
{
- Target* ret = p->recognize_by_name(name);
+ Target* ret = p->recognize_by_bfd_name(name);
+ if (ret != NULL)
+ return ret;
+ }
+ }
+ return NULL;
+}
+
+// Find a target using a GNU linker emulation. This is used to
+// support the -m option.
+
+Target*
+select_target_by_emulation(const char* name)
+{
+ for (Target_selector* p = target_selectors; p != NULL; p = p->next())
+ {
+ const char* pname = p->emulation();
+ if (pname == NULL || strcmp(pname, name) == 0)
+ {
+ Target* ret = p->recognize_by_emulation(name);
if (ret != NULL)
return ret;
}
supported_target_names(std::vector<const char*>* names)
{
for (Target_selector* p = target_selectors; p != NULL; p = p->next())
- p->supported_names(names);
+ p->supported_bfd_names(names);
+}
+
+// Push all the supported emulations onto a vector.
+
+void
+supported_emulation_names(std::vector<const char*>* names)
+{
+ for (Target_selector* p = target_selectors; p != NULL; p = p->next())
+ p->supported_emulations(names);
+}
+
+// Implement the --print-output-format option.
+
+void
+print_output_format()
+{
+ if (!parameters->target_valid())
+ {
+ // This case arises when --print-output-format is used with no
+ // input files. We need to come up with the right string to
+ // print based on the other options. If the user specified the
+ // format using a --oformat option, use that. That saves each
+ // target from having to remember the name that was used to
+ // select it. In other cases, we will just have to ask the
+ // target.
+ if (parameters->options().user_set_oformat())
+ {
+ const char* bfd_name = parameters->options().oformat();
+ Target* target = select_target_by_bfd_name(bfd_name);
+ if (target != NULL)
+ printf("%s\n", bfd_name);
+ else
+ gold_error(_("unrecognized output format %s"), bfd_name);
+ return;
+ }
+
+ parameters_force_valid_target();
+ }
+
+ const Target* target = ¶meters->target();
+ for (Target_selector* p = target_selectors; p != NULL; p = p->next())
+ {
+ const char* bfd_name = p->target_bfd_name(target);
+ if (bfd_name != NULL)
+ {
+ printf("%s\n", bfd_name);
+ return;
+ }
+ }
+
+ gold_unreachable();
}
} // End namespace gold.
projects / deliverable / binutils-gdb.git / blobdiff